So, what of it?
Her entire kit is so frontloaded into her Q + E combo and her passive is stronger than Lich Bane. The point of her W is to think on the fly, and to use these shards from your opponents in fights. In lane, you're very much safe from harm, so whatever you drop isn't going to cause you to instantly engage a player because if you don't have a clear path to land your E, your Q is super dodgeable and you're taking more damage then you're able to dish out in a trade.
Getting Redemption out of a minion isn't super helpful in an engage either. So is true for Smite. Youmuu's is the biggest offender here but even then, you could use it's active to run away, like a mini Ghost. But even shards like Ignite, Gunblade, Protobelt still fall flat because unless you know you can hit E, your only damaging ability can be dodged or you'll be forced to fire it off for less damage but from closer range. And Zoe isn't that great if you aren't making those long ranged Q shots on the fly.